JPH04361686A - Production of newspaper blank form and the same - Google Patents
Production of newspaper blank form and the sameInfo
- Publication number
- JPH04361686A JPH04361686A JP13885391A JP13885391A JPH04361686A JP H04361686 A JPH04361686 A JP H04361686A JP 13885391 A JP13885391 A JP 13885391A JP 13885391 A JP13885391 A JP 13885391A JP H04361686 A JPH04361686 A JP H04361686A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- calendering
- steam
- newsprint
- roll
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000003490 calendering Methods 0.000 claims abstract description 48
- 238000005259 measurement Methods 0.000 claims description 3
- 239000000123 paper Substances 0.000 description 89
- 238000000034 method Methods 0.000 description 36
- 238000007639 printing Methods 0.000 description 25
- 230000000694 effects Effects 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 13
- 239000002344 surface layer Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000007423 decrease Effects 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000007645 offset printing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000007644 letterpress printing Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003623 enhancer Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- TUSUWHFYKZZRIG-JQWMYKLHSA-N C([C@@H](NC(=O)[C@@H](C(C)C)NC(=O)[C@@H](CC(C)C)NC)C(=O)N[C@H](CC=1C=CC=CC=1)C(=O)N[C@H](CC(C)C)C(N)=O)C1=CC=CC=C1 Chemical compound C([C@@H](NC(=O)[C@@H](C(C)C)NC(=O)[C@@H](CC(C)C)NC)C(=O)N[C@H](CC=1C=CC=CC=1)C(=O)N[C@H](CC(C)C)C(N)=O)C1=CC=CC=C1 TUSUWHFYKZZRIG-JQWMYKLHSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229920006015 heat resistant resin Polymers 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Paper (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は新聞用紙の製造において
、所定の静的平滑度に仕上げる場合、嵩高で、剛性、不
透明度が高く、また静的平滑度は同一でも動的な平滑性
に優れるため印刷適性（インキ受理性）が向上し、更に
印刷作業性（紙粉、引張り強度等）も向上する新聞用紙
の製造方法および該製造方法で製造する新聞用紙に関す
るものである。[Industrial Application Field] The present invention is used in the production of newsprint to achieve a predetermined static smoothness. The present invention relates to a method for producing newsprint, which improves printing suitability (ink receptivity) and improves printing workability (paper dust, tensile strength, etc.), and to newsprint produced by the method.
【０００２】0002
【従来の技術】近年の新聞印刷は、凸版輪転印刷からオ
フセット輪転印刷への転換が進み、またカラー化や増頁
化も一層進展しつつある。BACKGROUND OF THE INVENTION In recent years, newspaper printing has progressed from letterpress rotary printing to offset rotary printing, and color printing and increased page size are also progressing.
【０００３】一般に新聞用紙の必要特性には、作業適性
と印刷適性がある。新聞はその速報性から断紙が最も嫌
われ、これに関連するシワ、ダブリなどの作業適性が厳
密に管理される。また印刷適性も、近年の公告重視、カ
ラー化、軽量化の傾向と共にその要求特性も多様化しつ
つある。特に凸版印刷では印刷後不透明度、インキ受理
性が、オフセット印刷では表面強度（紙粉）、インキ受
理性、印刷後不透明度等が問題になる。[0003] In general, the necessary characteristics of newsprint include workability and printability. Newspapers are most disliked due to their breaking news, and the workability of newspapers, such as wrinkles and doubling, is strictly controlled. In addition, the characteristics required for printing suitability are diversifying along with the recent trends toward emphasis on public notices, colorization, and weight reduction. Particularly in letterpress printing, post-print opacity and ink receptivity are issues, while in offset printing, surface strength (paper powder), ink receptivity, and post-print opacity are issues.
【０００４】特に紙粉は湿し水を用いるオフセット印刷
時に非常に大きな問題となる。これは主に原紙表面から
取られた微細繊維がインキに混入したり、ブランケット
に堆積して、印刷物にカスレ、汚れなどを発生させる。
またブランケット洗浄、保守など作業性の点でも問題と
なる。従って、このような印刷表面強度の問題を解決す
るため、一般にはゲートロール等の塗工装置でデンプン
を新聞用紙に塗工することで対応されている。[0004] In particular, paper dust poses a very big problem when offset printing uses dampening water. This is mainly caused by fine fibers taken from the surface of the base paper getting mixed into the ink or depositing on the blanket, causing scratches, stains, etc. on printed matter. There are also problems in terms of workability such as blanket cleaning and maintenance. Therefore, in order to solve the problem of printing surface strength, it is generally done by coating the newsprint with starch using a coating device such as a gate roll.
【０００５】また、インキ受理性はソフトなブランケッ
トを介するオフセット印刷よりも、直刷りの凸版印刷に
問題となる場合が多いが、これは紙の表面性（平滑度、
印圧下の動的平滑性）や地合い等が影響する。Furthermore, ink receptivity is more often a problem in direct letterpress printing than in offset printing using a soft blanket, but this is due to the surface properties of the paper (smoothness,
Dynamic smoothness under printing pressure), texture, etc. influence this.
【０００６】新聞用紙の印刷表面強度を上げる抄紙工程
での対策としては、上記の如くデンプン塗工が行われる
が、抄紙工程に欠かせないカレンダーパートは逆に表面
強度を低下させる傾向にある。これはカレンダー処理が
紙を一定の圧力で潰し、繊維間結合を切るためと考えら
れる。特に高い圧力でかつ低水分でカレンダー処理する
ほどその傾向が高い。また低温でカレンダー処理するほ
ど、所定の表面性に紙を仕上げるのに強線圧が必要とな
り、結果として表面強度の低下を招く。また強線圧カレ
ンダー処理によりその他一般の強度特性（引張り強度、
剛性等）も低下することから、新聞用紙の断紙等作業適
性にもマイナスとなる。[0006] As a measure in the papermaking process to increase the printed surface strength of newsprint, starch coating is carried out as described above, but the calender part, which is essential to the papermaking process, tends to reduce the surface strength. This is thought to be because the calendering process crushes the paper with a certain pressure and breaks the bonds between fibers. In particular, this tendency increases as the calendering process is performed at higher pressure and lower moisture content. Furthermore, the lower the calendering temperature, the more intense pressure is required to finish the paper to a predetermined surface property, resulting in a decrease in surface strength. In addition, other general strength properties (tensile strength,
The rigidity, etc.) also decreases, which has a negative impact on the suitability for tasks such as breaking newsprint.
【０００７】また、インキ受理性を向上させるために新
聞用紙の平滑性を上げようとすると、やはり高線圧でカ
レンダー処理する必要があり上記と同じ問題が発生する
。また同時に、紙の密度が上がってしまい嵩の低下、不
透明度、剛性の低下につながり、新聞用紙の印刷適性、
作業適性が劣る結果となる。[0007] Furthermore, when trying to increase the smoothness of newsprint in order to improve ink receptivity, it is still necessary to perform calender treatment at high linear pressure, resulting in the same problem as above. At the same time, the density of the paper increases, leading to a decrease in bulk, opacity, and stiffness, which reduces the printability of newsprint.
This results in poor work suitability.
【０００８】以上のような観点から、より低線圧の処理
で表面性を向上させるより好ましいカレンダー処理法と
して、高温ロールによる熱カレンダー処理あるいはカレ
ンダー処理直前に紙表面への水塗布あるいは加熱蒸気の
付与等の方法が考えられる。一般に紙の表面性を向上さ
せるためには、加熱よりも加湿の方が効果が高いとされ
ている（Ｍ．Ａｇｒｏｕｔｓ；Ｔａｐｐｉ Ｊ．６６
（１０），９６（１９８３））。従って熱カレンダー処
理するよりも加湿してカレンダー処理するほうが、同じ
表面性に紙を仕上げるならば低線圧で良いため、表面強
度の維持には有利と考えられる。また、水塗布による加
湿の場合は、紙の平均水分が最低でも約１．５％以上上
昇してしまい、密度の上昇幅が大きくなりすぎること、
また過度の加湿は逆にカレンダーロールへの紙粉の付着
トラブルも生じること等の問題がある。From the above points of view, as a more preferable calendering method that improves the surface properties by processing with a lower linear pressure, thermal calendering using a high-temperature roll or applying water or heating steam to the paper surface immediately before calendering is recommended. Possible methods include granting. Humidification is generally considered to be more effective than heating in order to improve the surface properties of paper (M. Agrouts; Tappi J. 66
(10), 96 (1983)). Therefore, humidified calendering is considered more advantageous in maintaining surface strength than thermal calendering, since a lower linear pressure is required to finish the paper to the same surface properties. In addition, in the case of humidification by water application, the average moisture content of the paper increases by at least about 1.5%, and the increase in density becomes too large.
Excessive humidification also causes problems such as the adhesion of paper powder to the calender rolls.
【０００９】以上より、紙に対して加温と加湿の両作用
をする加熱蒸気を使用し、カレンダー処理することがも
っとも好ましいと考えられる。[0009] From the above, it is considered most preferable to perform calender treatment using heated steam that has both heating and humidifying effects on paper.
【００１０】軽度の加熱蒸気を紙に付与した後にカレン
ダー処理する方法は近年開発され、その効果が認められ
ている（特開平２−１６０９９３）。但しこれは、塗工
軽量印刷用紙に適用されたものであり、以下の点で本発
明と基本的に異なる。[0010] A method of applying mildly heated steam to paper and then calendering the paper has been developed in recent years, and its effectiveness has been recognized (Japanese Unexamined Patent Publication No. 2-160993). However, this is applied to coated lightweight printing paper, and is fundamentally different from the present invention in the following points.
【００１１】（１）本発明に用いた新聞用紙は紙の上に
塗被液を塗工していないため当然表面性状が異なる。従
って、蒸気加湿した場合紙表面の水分、熱に対する可塑
性が異なる。(1) The newsprint used in the present invention naturally has different surface properties because no coating liquid is applied to the paper. Therefore, when the paper is humidified with steam, the moisture and heat plasticity of the paper surface differ.
【００１２】（２）本発明では、紙に蒸気を付与した後
のカレンダー処理条件を前記請求項に記述したごとく処
理温度を１００〜１５０℃に限定して初めて、本発明に
記載の品質上の効果が得られることを認めたものである
（特開平２−１６０９９３の方法では同じ効果は得られ
ない）。(2) In the present invention, the quality improvement described in the present invention is achieved only when the calender treatment conditions after applying steam to the paper are limited to a treatment temperature of 100 to 150°C as described in the above claim. It has been recognized that the same effect can be obtained (the same effect cannot be obtained with the method of JP-A-2-160993).
【００１３】また、高耐熱性の樹脂ロールを有するソフ
トカレンダーを用いて初めて上記のような高温条件でカ
レンダー処理することが可能となる。ソフトカレンダー
法は基本的にはオンマシンで（オフマシンの場合もある
）金属ロールとソフトロールを組合わせ、少ニップ数で
カレンダー掛けするものであり、ソフトロールとして耐
熱性の高い特殊樹脂を被覆したロールを使用し、金属ロ
ールを加湿型とする方式である。[0013] Furthermore, it is only possible to carry out calender treatment under the above-mentioned high temperature conditions by using a soft calender having a highly heat-resistant resin roll. The soft calendering method basically combines a metal roll and a soft roll on-machine (sometimes off-machine) and calenders with a small number of nips.The soft roll is coated with a special resin with high heat resistance. In this method, a metal roll is used as a humidifying type.
【００１４】[0014]
【発明が解決しようとする課題】本発明者等は、上記の
ごとき新聞用紙の有する印刷適性、作業適性の問題を解
決すべく鋭意検討を重ねた結果、加熱蒸気を用いてあら
かじめ紙表面を加湿かつ加熱した後、特定範囲の温度で
カレンダー処理することにより、従来の技術のように静
的平滑度を向上させなくても、印刷適性を向上すること
が可能となり、更に新たな印刷作業性（印刷表面強度、
引張り強度、剛度等）、嵩、不透明度も向上することも
認め、従来にない優れた品質を有する新聞用紙の製造方
法及びその製造方法により得られる新聞用紙を提供する
ものである。[Problem to be Solved by the Invention] The present inventors have conducted intensive studies to solve the problems of printing suitability and work suitability of newsprint as described above, and as a result, the inventors have found that the paper surface is pre-humidified using heated steam. Moreover, by calendering at a specific temperature after heating, it is possible to improve printability without improving static smoothness as in conventional techniques, and it also enables new printing workability ( printing surface strength,
It is also recognized that tensile strength, stiffness, etc.), bulk, and opacity are improved, and the present invention provides a method for producing newsprint and newsprint obtained by the method, which has unprecedentedly excellent quality.
【００１５】[0015]
【課題を解決するための手段】本発明は新聞用紙の製造
方法において、カレンダー処理直前に低圧で軽度の加熱
蒸気を、紙に平行に噴出させ、紙表面を加湿及び加熱し
た後、１００〜１５０℃範囲内でソフトカレンダー処理
を行うことを特徴とする新聞用紙の製造方法である。[Means for Solving the Problems] The present invention provides a method for producing newsprint, in which slightly heated steam is ejected at low pressure parallel to the paper immediately before calendering, and after humidifying and heating the paper surface, This is a method for producing newsprint, characterized by soft calendering within a temperature range of .degree.
【００１６】また本発明は、上記製造方法により得られ
る新聞用紙であり、さらにカレンダー処理後の平滑度（
ＪＡＰＡＮ Ｔａｐｐｉ Ｎｏ５ 王研式平滑度
試験器測定値）が、４０〜２００秒の範囲にある新聞用
紙が代表的である。[0016] The present invention also provides newsprint obtained by the above-mentioned manufacturing method, and further provides smoothness (
JAPAN Tappi No5 Oken type smoothness tester measurement value) is typical of newsprint in the range of 40 to 200 seconds.
【００１７】本発明の特徴は、新聞用紙のカレンダー処
理直前に、低圧で軽度の加熱蒸気を紙の表面に付着させ
、特定の温度条件でカレンダー処理する点にある。A feature of the present invention is that immediately before calendering the newsprint, mildly heated steam is applied to the surface of the paper at low pressure, and the calendering is carried out under specific temperature conditions.
【００１８】蒸気加湿装置については、実機での連続使
用の場合以下のような問題が指摘されている。即ち、（
１）蒸気ドレンが紙面に落下あるいは吹き飛ばされる、
（２）蒸気が周囲に飛散し、周辺の機器に結露し、紙に
結露水が落下する。（３）蒸気が周辺に漏れ、作業環境
が悪化する等の問題である。Regarding the steam humidifier, the following problems have been pointed out when it is used continuously in actual equipment. That is, (
1) Steam drain falls or is blown away on the paper surface,
(2) Steam scatters around, condenses on surrounding equipment, and condensed water falls on the paper. (3) There are problems such as steam leaking into the surrounding area and deteriorating the working environment.
【００１９】以上の問題点を解決するために、コアンダ
効果を利用して蒸気を紙に平行かつ対向させて流す装置
が提案された。この利点は、紙と蒸気の接触時間を長く
できること、紙につれまわってくる空気の侵入を防止で
きること、紙の走行安定性が向上することにある。In order to solve the above problems, an apparatus has been proposed in which steam is caused to flow parallel to and opposite to the paper by utilizing the Coanda effect. The advantages of this are that the contact time between the paper and steam can be extended, that air can be prevented from entering along with the paper, and that the running stability of the paper is improved.
【００２０】本装置の主たるコンセプトは以下の如くで
ある。The main concept of this device is as follows.
【００２１】蒸気のもつ熱エネルギーは紙と蒸気の温度
差によって蒸気が紙表面に微粒となって凝縮することに
よってつたえられる。この時、空気が介在すると空気は
断熱材の役目を果たし、熱授受の効率は著しく低下する
とともに、凝縮水は大きな粒子となってしまい、凝縮水
の紙への付着が不均一になってしまい、水分、温度ムラ
が大きくなってしまう。このように操業上の問題点を解
決するとともに熱効率を改善することによりはじめてカ
レンダー前での使用が可能となった。The thermal energy of the steam is transmitted by the steam condensing as fine particles on the paper surface due to the temperature difference between the paper and the steam. At this time, if air is present, the air acts as a heat insulator, and the efficiency of heat transfer and reception is significantly reduced. At the same time, the condensed water becomes large particles, and the condensed water adheres to the paper unevenly. , moisture, and temperature variations. By solving these operational problems and improving thermal efficiency, it became possible to use the machine before the calender.
【００２２】従来のカレンダー処理は、約５０〜８０℃
程度で処理しており、所定の表面性を得るためにはかな
り高い線圧で紙を潰している。同じ表面性をより低線圧
で得、印刷表面強度の低下を最小限に押さえるためには
、紙のごく表層部のみを緻密化することによって表面性
を出す必要がある。この手法としては、紙の表層部のみ
を加熱により潰すことによって表面性を発現させるいわ
ゆる温度勾配カレンダー法が従来から提案されている（
Ｍ．Ｆ．Ｇｒａｔｔｏｎ ｅｔ．ａｌ．；Ｐｕｌｐ
ａｎｄ Ｐａｐｅｒ Ｃａｎ．，８８（１２），
Ｔ４６１（１９８７）等）。[0022] Conventional calendering is performed at approximately 50-80°C.
In order to obtain the desired surface properties, the paper is crushed under fairly high linear pressure. In order to obtain the same surface quality at a lower linear pressure and to minimize the decrease in print surface strength, it is necessary to improve the surface quality by densifying only the very surface layer of the paper. As a method for this, the so-called temperature gradient calender method has been proposed, which develops surface properties by crushing only the surface layer of paper by heating (
M. F. Gratton et. al. ;Pulp
and Paper Can. ,88(12),
T461 (1987) etc.).
【００２３】また別な方法として、紙の表層部のみを加
湿により潰す方法がある。この方法は、加熱か加湿かの
違いだけでその作用機構は基本的に温度勾配カレンダー
法と同じである。即ち、加湿により紙の表層部のみを可
塑化した直後にカレンダー処理することによりカレンダ
ーロール表面を可塑化された紙表面に転写するメカニズ
ムである。Another method is to crush only the surface layer of paper by humidification. This method has basically the same mechanism of action as the temperature gradient calendar method, with the only difference being that heating or humidification is used. That is, the mechanism is such that only the surface layer of the paper is plasticized by humidification, and then calender treatment is performed immediately to transfer the calender roll surface to the plasticized paper surface.
【００２４】これらカレンダー法は、従来のカレンダー
法と比較し、同じ密度（嵩）に紙を仕上げた場合には、
より高い表面性が得られることになる。[0024] These calendering methods are compared with conventional calendering methods, and when paper is finished to the same density (bulk),
Higher surface properties will be obtained.
【００２５】本発明者らは、この加湿カレンダー法を鋭
意研究した結果、水シャワーにより加湿する場合は、加
湿量が多くなってしまい（紙の平均水分量として１．５
％以上増加する）、カレンダー処理により表面性は大き
く向上するが、同時に密度の上昇幅が大きくなりすぎて
しまい、所定の紙厚を保持しきれないこと、過度の加湿
により逆に紙粉がカレンダーロールに取られる問題も生
じることを認めた。密度の過度な上昇は紙の表層部だけ
でなく中層部まで水分が浸透してしまったことが原因と
考えられる。As a result of intensive research into this humidifying calendar method, the present inventors found that when humidifying with a water shower, the amount of humidification increases (1.5% as the average moisture content of paper).
Calendering greatly improves the surface properties, but at the same time, the increase in density becomes too large, making it impossible to maintain the desired paper thickness. He acknowledged that there would be problems with the roll being taken. The excessive increase in density is thought to be due to moisture penetrating not only the surface layer of the paper but also the middle layer.
【００２６】またこの方法では紙の水分プロファイルの
制御も難しいこと等の問題点があった。また、この場合
紙表面に付着した水がカレンダーロールの温度を下げて
いることもわかった。This method also has problems such as difficulty in controlling the moisture profile of the paper. It was also found that in this case, water adhering to the paper surface lowered the temperature of the calender roll.
【００２７】前記のように、紙表面を可塑化するにはカ
レンダーロールの温度はより高温で処理する方が望まし
いが、水シャワーによる加湿方法では、カレンダーロー
ル温度を下げる方向に作用するためにマイナスの効果と
なってしまう。As mentioned above, in order to plasticize the paper surface, it is preferable to treat the calender roll at a higher temperature, but in the humidification method using a water shower, the temperature of the calender roll is lowered, so there is a negative effect. This results in the effect of
【００２８】以上のような検討から、本発明者等は蒸気
による加湿方法が最良であることを認めた。本発明に用
いる蒸気は高温（１００℃以上）であるため、紙表面を
同時に加湿かつ加温して可塑化する。従って、蒸気加湿
直後にカレンダー処理した場合、紙の表層部のみ密度が
増加し、表面性が向上するが、紙中層部は密度が上がら
ず、紙全体としては平均密度がそれほど上がらず、低線
圧の処理で所定の表面性が得られ、印刷表面強度、作業
適性に優れた新聞用紙が得られるのである。From the above studies, the inventors of the present invention have recognized that the humidification method using steam is the best method. Since the steam used in the present invention has a high temperature (100° C. or higher), the paper surface is simultaneously humidified and heated to plasticize it. Therefore, when calendering is carried out immediately after steam humidification, only the surface layer of the paper increases in density and the surface properties are improved, but the density does not increase in the middle layer of the paper, and the average density of the paper as a whole does not increase much, resulting in low lines. Pressure treatment provides a predetermined surface quality, resulting in newsprint with excellent printing surface strength and workability.
【００２９】また従来のカレンダー法の場合と同じ密度
、嵩に紙を仕上げた場合には、高平滑で、インキ受理性
の優れた新聞用紙が得られるのである。Furthermore, if the paper is finished to the same density and bulk as in the case of the conventional calendering method, highly smooth newsprint with excellent ink receptivity can be obtained.
【００３０】また、本発明と同様な蒸気によるカレンダ
ー法を用いて、その効果を論じた先行技術（特開平２−
１６０９９３）とは以下の点で基本的に異なるものであ
る。まず本発明では、紙に蒸気を付与した後のカレンダ
ー処理条件を前記請求項に記述したごとく、カレンダー
処理温度を１００〜１５０℃に規定したことである。[0030] In addition, prior art (Japanese Patent Application Laid-Open No. 2002-110002) discusses the effects of using a calendering method using steam similar to the present invention.
160993) in the following points. First, in the present invention, the calendering temperature after applying steam to the paper is defined as 100 to 150°C, as described in the above claims.
【００３１】上記先行技術では、蒸気加湿によるカレン
ダー処理により、紙の密度上昇および嵩の減少を最小限
に押さえたまま、王研式平滑度（静的平滑度）を向上さ
せることが可能となり、それによって初めて印刷適性の
向上が可能であると論じている。しかし本方法によれば
、王研式平滑度が変わらなくても動的平滑度が向上する
ため、印刷適性が向上することが可能となった。[0031] In the above-mentioned prior art, by calendering using steam humidification, it is possible to improve the Oken type smoothness (static smoothness) while minimizing the increase in paper density and the decrease in bulk. It is argued that it is only through this that it is possible to improve printability. However, according to this method, the dynamic smoothness is improved even if the Oken type smoothness does not change, making it possible to improve the printability.
【００３２】更に上記先行技術では嵩（密度の逆数）、
剛度、不透明度は低下傾向にあるのに対し、本発明の方
法によれば嵩、不透明度、剛度も向上し、更に新たに印
刷作業性（印刷表面強度、引張り強度）も向上し得るこ
とも認めた。Furthermore, in the above prior art, the bulk (reciprocal of density),
While stiffness and opacity tend to decrease, the method of the present invention improves bulk, opacity, and rigidity, and can also improve printing workability (printing surface strength, tensile strength). Admitted.
【００３３】これらの理由は、紙の熱、水分に対する可
塑性、紙の熱伝導度、弾性率、紙層構造、弾性ロールの
弾性率等複雑な因子によって、紙の表面性の発現性メカ
ニズムが左右されると考えられるため定かではないが、
おおむね以下の違いが理由として考えられる。[0033] The reason for this is that the mechanism of the appearance of paper surface properties is influenced by complex factors such as paper's plasticity against heat and moisture, paper's thermal conductivity, elastic modulus, paper layer structure, and elastic roll's elastic modulus. Although it is not certain because it is thought that
The following differences can be considered as the main reasons.
【００３４】まず、前記のごとくカレンダー処理温度が
１００℃以下で処理した場合は、カレンダーロールの温
度が紙表層部の温度より低いため、あらかじめ蒸気によ
り加熱されたごく表層部の紙の温度が逆に冷やされる結
果となり、紙の表層部のみを可塑化する効果に対してマ
イナス効果となり結果として同じ密度に紙を仕上げても
王研式平滑度は向上しなくなる。First, when the calendering temperature is 100°C or less as described above, the temperature of the calender roll is lower than the temperature of the surface layer of the paper, so the temperature of the surface layer of the paper, which has been heated in advance by steam, is reversed. This results in a negative effect on the effect of plasticizing only the surface layer of the paper, and as a result, even if the paper is finished to the same density, the Oken type smoothness will not improve.
【００３５】また、１５０℃以上の高温で処理すると加
温と蒸気による加湿が過度になってしまい、相乗効果に
より表面性は大きく向上するものの、前記のように極端
に密度が上昇してしまい、結果として嵩、不透明度、剛
度の低下を招く。[0035] Furthermore, when processing at a high temperature of 150°C or higher, heating and humidification by steam become excessive, and although the surface properties are greatly improved due to the synergistic effect, the density increases extremely as described above. The result is a reduction in bulk, opacity, and stiffness.
【００３６】本発明の方法によれば、一つには１００℃
以上の高温で処理することにより、同じ王研式平滑度（
静的平滑度）を得るのにより低線圧で処理できるため、
嵩、不透明度が向上する。また紙に強いしごきを与えな
いで済むため、剛度、引張り強度、印刷表面強度が向上
する（１００℃以下では全く効果はない）。尚、ソフト
カレンダーのロールの温度は紙の温度より高く設定する
ことが好ましい。According to the method of the present invention, one of the
By processing at higher temperatures, the same Oken type smoothness (
Static smoothness) can be processed with low linear pressure,
Improves bulk and opacity. Furthermore, since the paper does not need to be subjected to strong ironing, the stiffness, tensile strength, and printing surface strength are improved (there is no effect at all below 100°C). Note that the temperature of the roll of the soft calender is preferably set higher than the temperature of the paper.
【００３７】また耐熱、耐圧性に優れた特殊樹脂ロール
を有するソフトカレンダー法を採用して初めて上記のよ
うな高温でカレンダー処理することが可能となる。なぜ
なら、一般的に使用されるスーパーカレンダーの場合に
は、弾性ロールであるコットンロールの内部発熱が大き
く、耐熱、耐圧性に限界があるため、ロールの最高使用
温度は一般に約８５℃以下に制限されるためである。ま
た板紙の製造で一般に使用されるグロスカレンダーの場
合には、金属ロール側は１００℃以上の高温でも使用さ
れるが、弾性ロールであるゴムロールは、耐久性に著し
く劣るため一般に高速抄紙機、高速コータには適用でき
ない。したがって、耐熱、耐圧性に優れた特殊樹脂ロー
ルを有するソフトカレンダーを採用して初めて高温、高
圧での使用が可能となる。[0037] Further, calendering at the above-mentioned high temperature becomes possible only by employing a soft calendering method having a special resin roll having excellent heat resistance and pressure resistance. This is because in the case of commonly used super calendars, the internal heat generation of the elastic cotton roll is large and there are limits to heat and pressure resistance, so the maximum operating temperature of the roll is generally limited to approximately 85°C or less. This is to be done. In addition, in the case of gloss calenders commonly used in the manufacture of paperboard, the metal roll side can be used at high temperatures of over 100°C, but the rubber rolls, which are elastic rolls, have significantly inferior durability and are generally used in high-speed paper machines. Not applicable to coaters. Therefore, it is only possible to use the calender at high temperatures and pressures by using a soft calender having a special resin roll with excellent heat resistance and pressure resistance.
【００３８】本発明の低圧で軽度の加熱蒸気流を紙に噴
出する装置としては、紙と平行に蒸気を噴出する装置、
ノズルから紙表面に一定の角度で噴出する装置などで、
蒸気が紙表面に付着して適度に紙の温度と水分を上昇さ
せる調整ができるものであれば使用できる。The device of the present invention for jetting a low-pressure, mildly heated steam stream onto paper includes a device that jets steam parallel to the paper;
A device that sprays water from a nozzle onto the paper surface at a fixed angle.
Any device can be used as long as it allows steam to adhere to the paper surface and adjust the temperature and moisture of the paper to an appropriate level.
【００３９】本発明において使用する蒸気は、低圧で軽
度の加熱蒸気で、紙に付与する場合、使用蒸気圧は１ｋ
ｇ／ｃｍ２ 以下で、蒸気流量が１５〜８０ｋｇ／Ｈｒ
／ｍ幅で、紙水分増加率が０．３〜１．２％の範囲内で
蒸気を付与することが望ましい。その理由は前記のよう
に蒸気圧が高く、流量も多すぎると、過剰の水分が紙中
層部まで浸透し、カレンダー処理後の嵩を大きく低下さ
せる。また紙への蒸気付着量が多すぎると塗工紙の場合
塗工層表面がカレンダーロールに取られる問題を生じる
。
逆に蒸気流量が少なすぎると、紙の平滑、光沢ムラを発
生させる恐れがあり、また加湿、加温の効果が少なくな
り、平滑性、印刷適性の向上効果も少なくなる。The steam used in the present invention is low-pressure, mildly heated steam, and when applied to paper, the steam pressure used is 1k.
g/cm2 or less, steam flow rate is 15 to 80 kg/Hr
It is desirable to apply steam within the range of paper moisture increase rate of 0.3 to 1.2% with a width of /m. The reason for this is that, as mentioned above, if the vapor pressure is high and the flow rate is too large, excess moisture will penetrate into the middle layer of the paper, greatly reducing the bulk after calendering. Furthermore, if the amount of vapor adhering to the paper is too large, there will be a problem in the case of coated paper that the surface of the coating layer will be taken away by the calender roll. On the other hand, if the steam flow rate is too small, there is a risk of uneven paper smoothness and gloss, and the effects of humidification and heating will be reduced, and the effect of improving smoothness and printability will also be reduced.
【００４０】したがって、適性な水分付与条件としては
、望ましくは紙水分増加率が０．３〜１．２％の範囲内
で蒸気を付与することが望ましい。[0040] Therefore, as appropriate moisture imparting conditions, it is desirable to apply steam so that the paper moisture increase rate is within the range of 0.3 to 1.2%.
【００４１】蒸気塗布後、カレンダーロールニップに入
るまでの時間はできる限り短い方が良く、０．０１〜０
．２５秒の範囲内が望ましい。これ以上時間が長いと蒸
気粒子が紙中層部に侵入し、カレンダー処理後の嵩を大
きく低下させる。[0041] The time after steam application until it enters the calender roll nip should be as short as possible, and should be between 0.01 and 0.
．． It is desirable that the time be within the range of 25 seconds. If the time is longer than this, steam particles will penetrate into the middle layer of the paper, greatly reducing the bulk after calendering.
【００４２】また本研究の結果、使用する弾性ロールの
硬度はショアＤ８７〜９３の範囲内にあることが望まし
いことがわかった。Further, as a result of this study, it was found that the hardness of the elastic roll used is preferably within the range of Shore D 87 to 93.
【００４３】その理由は明確ではないが、弾性ロールの
硬度がより低い場合には、ニップ幅は広くなり、紙に対
する面圧が大きくなる。この場合には、金属ロールの表
面を紙表面に転写する時間が長くなり、面圧とは逆に線
圧は小さくなるため、紙の光沢発現性は高くなるが、紙
の表層部より若干中層部近くまでの平滑性を測定する王
研式平滑度ではあまり大きな向上として現れない。Although the reason is not clear, when the hardness of the elastic roll is lower, the nip width becomes wider and the surface pressure against the paper becomes larger. In this case, the time required to transfer the surface of the metal roll onto the paper surface becomes longer and the linear pressure becomes smaller as opposed to the surface pressure. The Oken type smoothness, which measures smoothness close to the surface, does not show much of an improvement.
【００４４】逆に弾性ロール硬度が高い場合には、ニッ
プ幅も狭く、紙にかかる線圧も高いため王研式の平滑度
の向上も大きくなると考えられる。ただしロール硬度が
過度に高いと、異物通過時のロールの傷付きとその復元
性に劣り実用的でなく、品質的にも従来の金属ロール／
金属ロールの組み合わせによるカレンダー法と差がなく
なってしまう。従って適度な硬度範囲の弾性ロールを使
用する必要がある。On the other hand, when the elastic roll hardness is high, the nip width is narrow and the linear pressure applied to the paper is high, so it is thought that the improvement in Oken type smoothness will be large. However, if the roll hardness is excessively high, the roll will be damaged when foreign objects pass through it, and its recovery performance will be poor, making it impractical.
There is no difference between this method and the calender method, which uses a combination of metal rolls. Therefore, it is necessary to use an elastic roll with a suitable hardness range.
【００４５】また本発明の新聞用紙は、坪量は４０〜５
５ｇ／ｍ２ の範囲で、カレンダー処理後の平滑度（Ｊ
ＡＰＡＮ Ｔａｐｐｉ Ｎｏ５ 王研式平滑度試
験器測定値）が、４０〜２００秒の範囲のものが代表的
である。The newsprint of the present invention has a basis weight of 40 to 5.
Smoothness after calendering (J
APAN Tappi No. 5 Oken type smoothness tester measurement value) is typically in the range of 40 to 200 seconds.
【００４６】さらに本発明の新聞用紙は、サイズ剤、乾
燥紙力増強剤、湿潤紙力増強剤、定着剤、歩どまり向上
剤等通常抄紙で用いられる添加剤を必要に応じて含むも
のである。[0046] Furthermore, the newsprint of the present invention contains additives commonly used in paper making, such as a sizing agent, a dry paper strength enhancer, a wet paper strength enhancer, a fixing agent, and a yield improver, as required.
【００４７】以上本発明者等は、紙の表層部のみを可塑
化する手段として加熱あるいは加湿によるカレンダー法
を種々検討を重ねた結果、低圧で軽度の加熱蒸気を新聞
用紙の表面に付与し、紙表面を加湿かつ加熱した後、特
定範囲の温度でソフトカレンダー処理することにより、
従来の技術のように静的平滑度を向上させなくても、印
刷適性を向上することが可能となり、更に新たな印刷作
業性（印刷表面強度、引張り強度、剛度等）、嵩、不透
明度も向上することも認め、従来にない優れた品質を有
する新聞用紙が得られることを認めた。As described above, the present inventors have conducted various studies on the calendering method using heating or humidification as a means of plasticizing only the surface layer of paper, and as a result, the present inventors applied mild heated steam at low pressure to the surface of newsprint, After humidifying and heating the paper surface, soft calendering is performed at a specific temperature range.
It is now possible to improve printability without improving static smoothness as with conventional technology, and new printing workability (printing surface strength, tensile strength, stiffness, etc.), bulk, and opacity can also be improved. It was also recognized that newsprint of unprecedented quality could be obtained.
【００４８】[0048]
【実施例】本発明の実施例を示す。[Example] Examples of the present invention are shown below.
【００４９】カレンダー処理にチルドロールと樹脂ロー
ルの組み合わせからなる２段のソフトニップを有する２
スタックのソフトカレンダーを用い、各ニップ前に、チ
ルドロールに当たる側の紙表面に蒸気が噴出されるよう
に、加湿装置（相川鉄鋼株式会社のスチームフォイル）
を設置し下記の実験を行った。[0049] For calendering, a 2-stage soft nip consisting of a combination of chilled rolls and resin rolls is used.
Using a stack of soft calenders, before each nip, use a humidifier (steam foil from Aikawa Tekko Co., Ltd.) so that steam is ejected onto the paper surface on the side that hits the chilled rolls.
was installed and the following experiment was conducted.
【００５０】本実施例及び比較例で使用したソフトカレ
ンダーの詳細は次の通りである。[0050] Details of the soft calender used in the present examples and comparative examples are as follows.
【００５１】
本体メーカー：南千住製作所（株）
ロール面長：１０５０ｍｍ
加熱ロール：誘導発熱ジャケットロール（トクデン製）
ソフトロール：エラグラスＲＥ（金陽社製）ショアー硬
度Ｄ８９他
実施例１
坪量４８ｇ／ｍ２ の新聞用紙に、使用蒸気圧０．８ｋ
ｇ／ｃｍ２ 、蒸気流量が５０ｋｇ／Ｈｒ／ｍ幅に一定
条件下で蒸気を付与し、０．０３秒後に各カレンダーニ
ップに入る様にカレンダー処理した。その際、カレンダ
ーロール温度は１２０℃で処理した。Main unit manufacturer: Minamisenju Seisakusho Co., Ltd. Roll surface length: 1050 mm Heating roll: Induction heating jacket roll (manufactured by Tokuden)
Soft roll: Eraglass RE (manufactured by Kinyosha) Shore hardness D89, etc. Example 1 Newspaper with a basis weight of 48 g/m2, steam pressure used of 0.8 k
Steam was applied under constant conditions at a width of g/cm2 and a steam flow rate of 50 kg/Hr/m, and calendering was performed so that it entered each calender nip after 0.03 seconds. At that time, the calender roll temperature was 120°C.
【００５２】比較例１
カレンダーロール温度を７０℃でカレンダー処理するこ
と以外はすべて上記実施例１と同条件でカレンダー処理
した。Comparative Example 1 Calendar treatment was carried out under the same conditions as in Example 1 above, except that the calender roll temperature was 70°C.
【００５３】比較例２
蒸気をまったく使用せず、カレンダーロール温度を７０
℃でカレンダー処理すること以外はすべて上記実施例１
と同条件でカレンダー処理した。Comparative Example 2 No steam was used and the calender roll temperature was 70°C.
All the same as Example 1 above except for calendering at °C.
Calendar processing was carried out under the same conditions.
【００５４】＜品質評価方法＞・静的平滑度：ＪＡＰＡ
Ｎ Ｔａｐｐｉ Ｎｏ５王研式平滑度試験器で測定
した。<Quality evaluation method> Static smoothness: JAPA
Measured using N Tappi No5 Oken type smoothness tester.
【００５５】・動的平滑度：パーカプリントサーフ表面
粗さ（ＰＰＳ）計（野村商事製 ＰＰＳ−７８型）を
用い、μ単位の粗さとして表示する。数値の小さい方が
動的平滑性が高い。Dynamic smoothness: Expressed as roughness in μ units using a Parker Print Surf surface roughness (PPS) meter (model PPS-78, manufactured by Nomura Corporation). The smaller the number, the higher the dynamic smoothness.
【００５６】・印刷表面強度（紙粉）：ローランドオフ
セット印刷機を使用し、Ｂ４判試料１０００枚印刷した
後、ブランケットに堆積した紙粉を採取、定量しｍｇで
表示した。- Printing surface strength (paper powder): After printing 1000 sheets of B4 size samples using a Roland offset printing machine, the paper powder deposited on the blanket was collected, quantified, and expressed in mg.
【００５７】・インキ受理性：凸版印刷機（黒沢印刷精
機性デルマックス印刷機）を用いて印刷後、印刷面のイ
ンキの着肉均一性を５段階評価で視覚判定した。- Ink receptivity: After printing using a letterpress printing machine (Kurosawa Printing Seiki Delmax Printing Machine), the uniformity of ink coverage on the printed surface was visually judged on a five-point scale.
【００５８】・剛性：ＪＩＳ Ｐ−８１４３に従いク
ラークこわさ試験機で測定した。- Stiffness: Measured using a Clark stiffness tester according to JIS P-8143.
【００５９】・引張り強度：ＪＩＳ Ｐ−８１１４シ
ョッパー型試験器で測定した。- Tensile strength: Measured using a JIS P-8114 Schopper type tester.
【００６０】・不透明度（％）：ＪＩＳ Ｐ−８１３
８に準じて測定した。・Opacity (%): JIS P-813
Measured according to 8.
【００６１】[0061]
【００６２】[0062]
【発明の効果】表から明らかなように、従来の蒸気加湿
カレンダー技術と異なり、紙に蒸気を付与した後のカレ
ンダー処理条件を前記請求項に記述したごとく、カレン
ダー処理温度を１００〜１５０℃に規定してソフトカレ
ンダー処理する本発明の方法により、王研式平滑度が変
わらなくても動的平滑度が向上するため、印刷適性（イ
ンキ受理性）を向上することが可能となる。更に嵩、不
透明度も向上し、新たな印刷作業性（紙粉、剛度、引張
り強度）も向上させ得る。[Effects of the Invention] As is clear from the table, unlike the conventional steam humidification calendering technique, the calendering conditions after applying steam to the paper are as described in the above claims, and the calendering temperature is set at 100 to 150°C. By the method of the present invention, which performs defined soft calendering, the dynamic smoothness is improved even if the Oken type smoothness is not changed, so that it is possible to improve the printability (ink receptivity). Furthermore, the bulk and opacity are improved, and new printing workability (paper powder, stiffness, tensile strength) can also be improved.
【００６３】従って、本発明の新聞用紙の製造方法によ
り製造された新聞用紙は、従来にない優れた品質特性が
得られ、その製品価値は極めて大なるものがある。[0063] Therefore, the newsprint produced by the newsprint production method of the present invention has excellent quality characteristics never seen before, and its product value is extremely high.
Claims (3)
紙のソフトカレンダー処理直前に、低圧で軽度の加熱蒸
気を付与し紙表面を加湿及び加熱した後、ソフトカレン
ダーロールの温度が１００〜１５０℃の範囲内でのソフ
トカレンダー装置を用いてカレンダー処理を行うことを
特徴とする新聞用紙の製造方法。Claim 1. In a method for producing newsprint, immediately before soft calendering of newsprint, mildly heated steam is applied at low pressure to humidify and heat the paper surface, and then the temperature of the soft calender roll is 100 to 150°C. 1. A method for producing newsprint, characterized in that calendering is carried out using a soft calendering device within a range.
れた新聞用紙。2. Newspaper produced by the production method according to claim 1.
Ｎ Ｔａｐｐｉ Ｎｏ５ 王研式平滑度試験器測
定値）が、４０〜２００秒の範囲にある請求項２記載の
新聞用紙。[Claim 3] Smoothness after calendering (JAPA
3. The newsprint according to claim 2, wherein the N Tappi No. 5 Oken smoothness tester measurement value is in the range of 40 to 200 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3138853A JP2972387B2 (en) | 1991-06-11 | 1991-06-11 | Newspaper production method and newsprint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3138853A JP2972387B2 (en) | 1991-06-11 | 1991-06-11 | Newspaper production method and newsprint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04361686A true JPH04361686A (en) | 1992-12-15 |
| JP2972387B2 JP2972387B2 (en) | 1999-11-08 |
Family
ID=15231687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3138853A Expired - Fee Related JP2972387B2 (en) | 1991-06-11 | 1991-06-11 | Newspaper production method and newsprint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2972387B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06235187A (en) * | 1993-01-16 | 1994-08-23 | Vib Apparatebau Gmbh | Method and apparatus for improving luster and/or smoothness of material web |
| JP2002173896A (en) * | 2000-09-26 | 2002-06-21 | Nippon Paper Industries Co Ltd | Newsprint paper for offset printing |
| JP2002285496A (en) * | 2001-03-26 | 2002-10-03 | Nippon Paper Industries Co Ltd | Newsprint paper for offset printing and method for producing the same |
| JP2005516134A (en) * | 2002-01-29 | 2005-06-02 | メッツォ ペーパー インコーポレイテッド | Coated or uncoated fiber web processing equipment |
| JP2006501375A (en) * | 2002-08-02 | 2006-01-12 | メッツォ ペーパー インコーポレイテッド | Stepped calendar |
| JP2008274518A (en) * | 2007-03-30 | 2008-11-13 | Nippon Paper Industries Co Ltd | Method for producing printing paper |
| US7691232B2 (en) * | 2004-03-06 | 2010-04-06 | Voith Paper Patent Gmbh | Method and device for treating a paper or cardboard web |
-
1991
- 1991-06-11 JP JP3138853A patent/JP2972387B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06235187A (en) * | 1993-01-16 | 1994-08-23 | Vib Apparatebau Gmbh | Method and apparatus for improving luster and/or smoothness of material web |
| JP2002173896A (en) * | 2000-09-26 | 2002-06-21 | Nippon Paper Industries Co Ltd | Newsprint paper for offset printing |
| JP2002285496A (en) * | 2001-03-26 | 2002-10-03 | Nippon Paper Industries Co Ltd | Newsprint paper for offset printing and method for producing the same |
| JP2005516134A (en) * | 2002-01-29 | 2005-06-02 | メッツォ ペーパー インコーポレイテッド | Coated or uncoated fiber web processing equipment |
| JP2006501375A (en) * | 2002-08-02 | 2006-01-12 | メッツォ ペーパー インコーポレイテッド | Stepped calendar |
| US7691232B2 (en) * | 2004-03-06 | 2010-04-06 | Voith Paper Patent Gmbh | Method and device for treating a paper or cardboard web |
| JP2008274518A (en) * | 2007-03-30 | 2008-11-13 | Nippon Paper Industries Co Ltd | Method for producing printing paper |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2972387B2 (en) | 1999-11-08 |
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